What might have been the effect on the vietnam war if the border of laos had been closed and north vietnam had not been able to operate in the country

The NVA would have penetrated into Laos anyway, and spread the war with them; probably knowing full well that the United States would do the same. The NVA didn't care; for them it was do or die. Captured NVA pith helmets were found with their own graffiti written on them; "Born in the North, died in the South." There was no way the North could have survived continuing the war by travelling through the sea, along the coastline; the USN would have sunk every craft that tried. There was no way the North would have tried to cross the DMZ...that was a channelized kill zone; they knew it, we knew it. That left Laos...and that couldn't be channeled & Laos couldn't be sunk. The NVA could get lost in that country, and nobody could find them; they knew it, so did we. So, Laos was the place. (: good luck and hope i helped